Virtually the same thing happened to me 2 days ago for the same extension as you. The IOs said the request came from above and didn’t understand the reasoning. Specifically they needed copies of an updated bank book showing a deposit of ‘200 to 300 bahts’ that day, not a withdrawal. Luckily the amount in my account was still fine, and I stuck in 1000baht, got the copies and delIvered them to the IO, who seemed apologetic and happy. Still waiting for final approval.
This was in Mukdahan.